Git apply fails on case-only rename on case-insensitive filesystem

[Tao Klerks <tao@klerks.biz>]

Hi folks,

I just found out that "git apply" has a faulty existence check on
case-insensitive filesystems (or, at least, windows?).

Simplest repro I could come up with:

git init renamefun
cd renamefun
echo "Test" > file1
git add .
git commit -m "first commit"
git mv file1 File1
git commit -m "second commit"
git checkout master~1
git diff master~1..master | git apply

-> error:
error: File1: already exists in working directory

(on linux, the same sequence of commands completes correctly)

I was able to work around this for my purposes by avoiding rename
detection on the diff, and only passing the "Add" (and "Modify")
operations through to the "apply", after having separately/manually
handled the deletions.

Is this a known issue that someone might be working on, or worth
digging into / trying to fix?

Thanks,
Tao